Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
  • C09K8/02—Well-drilling compositions
  • C09K8/03—Specific additives for general use in well-drilling compositions
  • C09K8/035—Organic additives
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
  • C09K8/60—Compositions for stimulating production by acting on the underground formation
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
  • C09K8/60—Compositions for stimulating production by acting on the underground formation
  • C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
  • C09K8/60—Compositions for stimulating production by acting on the underground formation
  • C09K8/84—Compositions based on water or polar solvents
  • C09K8/86—Compositions based on water or polar solvents containing organic compounds
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
  • C09K8/60—Compositions for stimulating production by acting on the underground formation
  • C09K8/84—Compositions based on water or polar solvents
  • C09K8/86—Compositions based on water or polar solvents containing organic compounds
  • C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
  • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons

Definitions

• Viscosifying surfactant fluids have continued to grow in use in oilfield applications because of their advantages over conventional polymer systems. Such advantages include higher permeability in the oil bearing zone, lower formation or subterranean damage, higher viscosifier recovery after fracturing, elimination of need for enzymes or oxidizers to break down viscosity, and easier hydration and faster build-up to optimum viscosity.
• viscosifying surfactants at low concentrations can result in unacceptably long shear recovery time after high shear operation. Accordingly, it would be desirable to have a fluid that maintains a high level of viscosity performance at high temperatures and shear recovery comparable to fluids with a relatively high concentration of viscosifying surfactants.
• the present disclosure provides a method of reducing shear recovery time of a viscosifying surfactant fluid system that includes introducing a viscosifying surfactant fluid system into a subterranean formation, wherein the fluid includes a major portion of a surfactant and a hydrophobically-modified associative polymer in a concentration sufficient to shorten the shear recovery time of the fluid system compared to the shear recovery time of the fluid system without the polymer.
• the surfactant is selected from Formulas I, II, III, IV, and combinations thereof.
• the hydrophobically-modified associative polymer (AP) includes at least one water-soluble part selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid, 2-acrylamidomethylpropanesulfonic acid, N-vinyl pyrrolidone, N-vinyl formamide, and mixtures thereof.
• the AP includes at least one water-insoluble part selected from the group consisting of straight or branched alkyl or alkylaryl alcohol esters of acrylic or methacrylic acid, straight or branched alkyl or alkylaryl amides of acrylamide or methacrylamide, styrene, butadiene, 1-vinylnaphthalene, and mixtures thereof.
• the method includes introducing a viscosifying surfactant fluid system into a subterranean formation, wherein the fluid includes a major portion of a surfactant and a hydrophobically-modified associative polymer (AP) as a shear recovery agent (SRA) in a concentration sufficient to shorten the shear recovery time of the fluid system compared to shear recovery time of the fluid system without the SRA.
• AP hydrophobically-modified associative polymer
• SRA shear recovery agent
• the viscosifying surfactant is selected from Formulas I, II, III, IV, and combinations thereof:
• R 1 is selected from alkyl, alkenyl, alkylarylalkylene, alkenylarylalkylene, alkylaminoalkylene, alkenylamino-alkylene, alkylamidoalkylene, or alkenylamidoalkylene, wherein each of said alkyl groups contain from about 14 to about 24 carbon atoms and may be branched or straight chained and saturated or unsaturated, and wherein said alkylene groups have from about 1 to about 6 carbon atoms.
• R 2 , R 3 and R 4 are the same or different and are alkyl or hydroxyalkyl of from 1 to about 5 carbon atoms, or R 3 and R 4 or R 2 together with the nitrogen atom to which they are bonded form a heterocyclic ring of up to 6 members.
• the surfactant of Formula I is selected from oleyl amidopropyldimethyl betaine:
• R 1 is a hydrocarbyl group that may be branched or straight-chain, aromatic, aliphatic or olefinic and contains from about 8 to about 30 carbon atoms. In an embodiment, R 1 is ethoxylated.
• R 2 , R 3 individually hydrogen it a methyl group;
• R 4 and R 5 or R 6 are individually hydrogen or a hydroxyl group with the provision that at least one of the R 4 and R 5 or R 6 is a hydroxyl groups.
• the surfactant of Formula II is selected from erucyl amidopropyl hydroxypropyl sulfobetaine:
• R 1 is a hydrocarbyl group that may be branched or straight-chain, aromatic, aliphatic or olefinic and contains from about 8 to about 30 carbon atoms.
• R 1 is ethoxylated.
• R 2 , R 3 and R 4 are the same or different and are alkyl or hydroxyalkyl of from 1 to about 5 carbon atoms, or R 3 and R 4 or R 2 together with the nitrogen atom to which they are bonded form a heterocyclic ring of up to 6 members.
• the surfactant of Formula III is selected from stearyl trimethyl ammonium chloride:
• R 7 is a saturated or unsaturated, straight or branched chain aliphatic group of from about 7 to about 30 carbon atoms
• R 9 is a straight or branched chain, saturated or unsaturated divalent alkylene group of from 2 to about 6 carbon atoms
• R 10 and R 11 are the same or different and are alkyl or hydroxyalkyl of from 1 to about 4 carbon atoms, or R 10 and R 11 together with the nitrogen atom to which they are bonded form a heterocyclic ring of up to 6 members
• R 8 is hydrogen or a alkyl or hydroxyalkyl group of from 1 to about 4 carbon atoms.
• the surfactant of Formula IV includes tallow amidopropyl dimethylamine oxide:
• the shear recovery agent or rheology enhancer is a hydrophobically-modified associative polymer (AP) that is water-soluble, but includes one or more water-insoluble short blocks.
• AP hydrophobically-modified associative polymer
• the water-soluble part is selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid, 2-acrylamidomethylpropanesulfonic acid, N-vinyl pyrrolidone, N-vinyl formamide, and mixtures thereof.
• the water insoluble part having hydrophobic properties is selected from straight or branched alkyl or alkylaryl alcohol esters of acrylic or methacrylic acid, straight or branched alkyl or alkylaryl amides of acrylamide or mathacrylamide, styrene, butadiene, 1-vinylnaphthalene and mixtures thereof.
• the hydrophobically-modified associative polymer is a copolymer including monomers selected from anionic monomers, cationic monomers, nonionic monomers, hydrophobically-modified monomers, and combinations thereof.
• anionic monomers include acrylic acid and 2-Acrylamido-2-methylpropane sulfonic acid.
• a non-limiting example of a nonionic monomer includes acrylamide.
• a non-limiting example of a cationic monomer includes acryloyloxyethyltrimethylammonium chloride (AETAC).
• the hydrophobically-modified monomer is an anionic monomer (e.g.
• hydrophobic monomers include, but not limited to, stearyl acrylate, octadecyl dimethyl allyl ammonium chloride, and n-lauryl-2-methyl-acrylamide.
• An example of a hydrophobically-modified associative polymer (AP) is poly (acrylic acid)-co-(2-acrylamido-2-methylpropanesulfonic acid) with ethylhexyl acrylate as the hydrophobic monomer.
• AP hydrophobically-modified associative polymer
• the associative hydrophobic monomer of the water-insoluble part possesses a structure selected from Formulae (V)-(IX) and combinations thereof.
• R 1 is selected from H or CH 3 and R 2 is selected from
• R has a polymerizable vinylic function
• R 1 , and R 2 are identical or different, and represent hydrogen atoms or alkyl groups
• R′ is a hydrophobic group comprising at least 6 and at most 36 carbon atoms, preferentially at least 12 and at most 24 carbon atoms, and very preferentially at least 18 and at most 22 carbon atoms.
• R is H or CH 3 ; wherein R 1 is a —(CH 2 ) p H alkyl chain; wherein p is an integer from 1 to about 4; wherein j is an integer from 1 to about 50; wherein k is an integer from 0 to about 20, wherein h is 1 or 2; and wherein X has the following structure:
• n and n are, independently, positive integers from 1 to 39 and m+n represents an integer from 4 to 40.
• R 3 is H or CH 3 ;
• R 4 is an alkyl chain containing 1 to about 4 carbons;
• M is an integer from 1 to about 50; and
• N is 0 or an integer of less than or equal to M.
• R 1 is H or CH 3 ; x is an integer from 5 to about 50, R 2 is an alkyl chain containing 1 to about 32 carbons or a cycloalkyl ring or a single aromatic 4-6 membered ring.
• the AP is present in a concentration sufficient to shorten the shear recovery time of the fluid.
• the concentration of shear recovery agent ranges from 0.005 wt % to 5 wt %, preferably from 0.01 wt % to 0.1 wt %.
• the fluid recovers at least 50% of its final viscosity within 50 seconds.
• the fluid recovers 50% of its final viscosity between 15-30 seconds.
• the SRA is selected from hydrophobically-modified associative polymers (AP) having a molecular weight of at least 500 gm/mol or mixtures thereof. In general, the addition of AP having molecular weights greater than 25,000 gm/mol was found to be effective at higher concentrations of viscosifying surfactant fluid.
• the method includes introducing a viscosifying surfactant fluid system into a subterranean formation, wherein the fluid system includes a major portion of a surfactant and a hydrophobically-modified associative polymer (AP) as a shear recovery agent (SRA) in a concentration sufficient to shorten the shear recovery time of the fluid system compared to shear recovery time of the fluid system without the SRA.
• AP hydrophobically-modified associative polymer
• SRA shear recovery agent
• the fluid system is useful in many oilfield applications, including, but not limited to, fracturing and completion operations.
• the fluid system further includes at least one solvent selected from water, alcohols, and combinations thereof.
• the fluid system includes an alcohol selected from monohydric alcohols, dihydric alcohols, polyhydric alcohols, and combinations thereof.
• the fluid system includes an alcohol selected from alkanols, alcohol alkoxylates, and combinations thereof.
• the fluid system includes an alcohol selected from methanol, ethanol, isopropanol, butanol, propylene glycol, ethylene glycol, polyethylene glycol, and combinations thereof.
• the fluid system further includes one or more additives.
• the fluid includes one or more additives selected from corrosion inhibitors, iron control agents, clay stabilizers, calcium sulfate inhibitors, mutual solvents, and combinations thereof.
• the corrosion inhibitor is selected from alcohols (e.g. acetylenics); cationics (e.g. quaternary ammonium salts, imidazolines, and alkyl pyridines); and nonionics (e.g. alcohol ethoxylates).
• the shear recovery time is determined using one or both of the following two methods (Methods A and B).
• Method A is a visual observation after the fluid is sheared at high speeds and it “lips” back when shear is stopped. This lip method includes measuring the time it takes for the fluid to snap back when poured from an inclined upper beaker or cup containing the fluid.
• the shear recovery time can be measured on a rheometer by shearing the fluid at 935/s for 30 seconds, then monitoring the time it takes for the fluid to reach a final steady state value. The shear recovery time is then defined as the time it takes for the viscosity to reach 50% of its final equilibrium value at 100/s (Method B).
• Various formulations containing a certain amount of active surfactant were mixed in water or brines with or without a shear recovery agent (SRA) for 5 minutes at 7000 rpm. After an additional 20 seconds, the fluid was poured from a blender to a beaker and the time it took to “lip” was measured as outline in Method A.
• SRA shear recovery agent
• a mixture of 2.6% active erucyl quat in 6% KCl had a shear recovery time greater than 180 seconds without any shear recovery agent compared with 17 and 12 seconds with the addition of 0.01 wt. % and 0.015 wt. % SRA, respectively, using Method A.
• compositions and methods are described in terms of “comprising,” “containing,” or “including” various components or steps, the compositions and methods can also “consist essentially of” or “consist of” the various components, substances and steps.
• the term “consisting essentially of” shall be construed to mean including the listed components, substances or steps and such additional components, substances or steps which do not materially affect the basic and novel properties of the composition or method.
• a composition in accordance with embodiments of the present disclosure that “consists essentially of” the recited components or substances does not include any additional components or substances that alter the basic and novel properties of the composition. If there is any conflict in the usages of a word or term in this specification and one or more patent or other documents that may be incorporated herein by reference, the definitions that are consistent with this specification should be adopted.

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• 2017
  • 2017-05-25 CN CN201780032273.6A patent/CN109196074A/zh active Pending
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